APA (7th ed.) Zitazioa
RUHM, C. (2003). HEALTHY LIVING IN HARD TIMES. INSTITUTE FOR THE STUDY OF LABOR.
Chicago Style (17th ed.) Zitazioa
RUHM, C.J. HEALTHY LIVING IN HARD TIMES. BONN: INSTITUTE FOR THE STUDY OF LABOR, 2003.
MLA (9th ed.) Zitazioa
RUHM, C.J. HEALTHY LIVING IN HARD TIMES. INSTITUTE FOR THE STUDY OF LABOR, 2003.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.